KR20030009661A - portable computer and controlling method thereof - Google Patents

portable computer and controlling method thereof Download PDF

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Publication number
KR20030009661A
KR20030009661A KR1020010044211A KR20010044211A KR20030009661A KR 20030009661 A KR20030009661 A KR 20030009661A KR 1020010044211 A KR1020010044211 A KR 1020010044211A KR 20010044211 A KR20010044211 A KR 20010044211A KR 20030009661 A KR20030009661 A KR 20030009661A
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South Korea
Prior art keywords
unit
backlight
inverter
voltage
contrast
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KR1020010044211A
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Korean (ko)
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KR100381423B1 (en
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이창흠
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삼성전자주식회사
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Priority to KR10-2001-0044211A priority Critical patent/KR100381423B1/en
Priority to CNB011368810A priority patent/CN1264086C/en
Priority to JP2001343252A priority patent/JP3697201B2/en
Priority to US10/078,348 priority patent/US6963329B2/en
Publication of KR20030009661A publication Critical patent/KR20030009661A/en
Application granted granted Critical
Publication of KR100381423B1 publication Critical patent/KR100381423B1/en

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F15/00—Digital computers in general; Data processing equipment in general
    • G06F15/02—Digital computers in general; Data processing equipment in general manually operated with input through keyboard and computation using a built-in program, e.g. pocket calculators
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/36—Controlling
    • H05B41/38—Controlling the intensity of light
    • H05B41/39—Controlling the intensity of light continuously
    • H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor
    • H05B41/3921—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations
    • H05B41/3922—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations and measurement of the incident light
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/36—Controlling
    • H05B41/38—Controlling the intensity of light
    • H05B41/39—Controlling the intensity of light continuously
    • H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor
    • H05B41/3921—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations
    • H05B41/3927—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations by pulse width modulation
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0606—Manual adjustment
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/064—Adjustment of display parameters for control of overall brightness by time modulation of the brightness of the illumination source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/066—Adjustment of display parameters for control of contrast
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Computing Systems (AREA)
  • General Engineering & Computer Science (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Liquid Crystal (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Calculators And Similar Devices (AREA)

Abstract

PURPOSE: A portable computer and its control method is provided to control luminosity irrespective of an input impedance of an inverter by adjusting a back light control voltage to an inverter drive voltage according to a signal sensed by a contrast sensor. CONSTITUTION: The system comprises an adapter(2), a battery(3), a power source selection circuit(7), a DC/DC conversion circuit(5), a main board(9), an LCD(17), a contrast sensor(17b), a key input device(11), a controller(15), a DC converter(19), and a voltage adjuster(21). The power source selection circuit(7) selects one between the adapter(2) and the battery as a power source. The DC/DC conversion circuit(5) converts the power, supplied by the selected power source, into a drive voltage for each component. The main board(9), having a video card, controls a basic operation of each component. The LCD(17) outputs image signals offered by the video card, and embeds the contrast sensor(17b). The key input device(11) sets manually the luminosity of a back light. The controller(15) transmits the control signals, offered through the main board(9), to each hardware component. The DC converter(19) converts PWM(Pulse Width Modulation) signals, output by the contrast sensor(17b), into DC signals. The voltage adjuster(21) adjusts the DC signals, output by the DC converter(19), to a drive voltage of a DC/AC inverter(23).

Description

휴대용 컴퓨터와 그 제어방법{portable computer and controlling method thereof}Portable computer and controlling method

본 발명은 휴대용 컴퓨터에 관한 것으로서, 보다 상세하게는 LCD백라이트를 자동조절할 수 있는 휴대용 컴퓨터 및 휴대용 컴퓨터의 제어방법에 관한 것이다.The present invention relates to a portable computer, and more particularly, to a portable computer capable of automatically adjusting the LCD backlight and a control method of the portable computer.

일반적으로, 휴대용 컴퓨터는 하드디스크 및 메모리 등의 하드웨어장치와 마이컴(micro processor)으로 구성된 시스템이 마련된 컴퓨터본체와, 컴퓨터본체와 힌지결합하며 화상을 표시하는 LCD패널 및 LCD패널을 조명하는 백라이트가 마련되는 디스플레이장치와, 시스템과 디스플레이장치에 전원을 공급하는 전원공급부를 갖는다.In general, a portable computer has a computer main body provided with a system composed of hardware devices such as a hard disk and a memory and a microprocessor, an LCD panel which hinges with the computer main body and displays an image, and a backlight for illuminating the LCD panel. And a power supply unit for supplying power to the system and the display device.

휴대용 컴퓨터에는 사용자 조작에 의해 백라이트의 밝기(Brightness)를 조절하는 조절볼륨(Volume) 또는 단축키가 마련되어, 디스플레이화면의 밝기를 조절할 수 있다.The portable computer is provided with an adjusting volume or a shortcut key for adjusting the brightness of the backlight by a user's operation, thereby adjusting the brightness of the display screen.

그런데, 종래의 휴대용 컴퓨터는 디스플레이부의 백라이트의 밝기가 고정되므로, 영상신호의 콘트라스트(명도대비)신호에 관계없이 일정한 백라이트의 밝기로 표시되므로 콘트라스트에 관계없이 일정한 밝기로 표시되므로 전력소모가 낭비될 수 있으며, 화면상태(콘트라스트)에 맞게 사용자가 백라이트 밝기를 조정해야 하는 불편함이 있다.However, in the conventional portable computer, since the brightness of the backlight of the display unit is fixed, regardless of the contrast (brightness contrast) signal of the image signal, the brightness of the backlight is displayed at a constant brightness regardless of the contrast, so power consumption may be wasted. In addition, there is an inconvenience in that the user needs to adjust the backlight brightness according to the screen state (contrast).

그래서, LCD디스플레이부에 LCD패널에 표시되는 영상신호의 콘트라스트를 감지하는 스마트모듈을 장착하여, 스마트모듈에서 감지된 콘트라스트데이터를 백라이트밝기조정신호로 이용하는 휴대용 컴퓨터가 개발되어 있다.Thus, a portable computer has been developed in which a smart module for detecting the contrast of an image signal displayed on an LCD panel is mounted on the LCD display unit, and the contrast data detected by the smart module is used as a backlight brightness adjustment signal.

스마트모듈을 장착한 휴대용 컴퓨터는 사용자가 백라이트를 Max로 설정해놓은 상태인 경우 영상신호의 콘트라스트에 따라 Min ~ Max 범위로 백라이트밝기가 자동으로 조절되고, Typical로 설정된 상태인 경우에는 Min~Typical범위로 자동으로 백라이트밝기가 조절된다.When the user sets the backlight to Max, the portable computer equipped with the smart module automatically adjusts the backlight brightness from the Min to Max range according to the contrast of the video signal, and from the Min to Typical range if the user sets to Typical The backlight brightness is automatically adjusted.

그런데, 스마트모듈을 장착한 휴대용 컴퓨터는 도 4를 참조하면, 사용자 조작에 따른 백라이트조정신호를 출력하는 제어부가 인버터와 직접 연결되지 아니하므로 즉, 제어부에서 출력되는 제어신호는 스마트모듈에서 출력되는 제어신호의 전압레벨의 기준이 다르다. 이에 따라 스마트모듈을 장착하지 않은 일반적인 액정디스플레이장치를 연결할 경우에는 별도의 전압보정회로를 연결하여야 하므로 제조과정이 번거로워지고 제품원가가 높아진다. 또한, 스마트모듈을 장착한 휴대용 컴퓨터는 콘트라스트가 급격히 변화함에 따라 백라이트의 밝기가 자동조절될 때 백라이트의 밝기가 서서히 변화되는 단점이 있다.However, in the portable computer equipped with the smart module, referring to FIG. 4, since the controller for outputting the backlight adjustment signal according to the user's operation is not directly connected to the inverter, that is, the control signal output from the controller is output from the smart module. The voltage level of the signal is different. Accordingly, when connecting a general liquid crystal display device without a smart module, a separate voltage correction circuit must be connected, which makes the manufacturing process cumbersome and increases the product cost. In addition, a portable computer equipped with a smart module has a disadvantage in that the brightness of the backlight is gradually changed when the brightness of the backlight is automatically adjusted as the contrast is rapidly changed.

따라서, 본 발명의 목적은, 콘트라스트감지부의 감지신호에 따른 백라이트조정전압을 인버터의 구동전압에 맞추어 정상적으로 백라이트의 밝기를 조절할 수 있으며, 인버터의 입력임피던스에 관계없이 최적의 상태로 동작할 수 있게 하는 것이다. 그리고, 일반 액정디스플레이장치를 휴대용 컴퓨터에 연결시에 별도의 전압보정회로가 필요하지 않는 휴대용 컴퓨터를 제공하는 것이다. 또한, 본 발명의 또다른 목적은, 사용자가 백라이트자동조절을 선택적으로 이용할 수 있는 휴대용 컴퓨터와 그 제어방법을 제공하는 것이다.Accordingly, an object of the present invention is to adjust the backlight brightness according to the drive voltage of the inverter according to the backlight control voltage according to the detection signal of the contrast sensing unit, and to operate in an optimal state regardless of the input impedance of the inverter. will be. In addition, the present invention provides a portable computer that does not require a separate voltage correction circuit when the general liquid crystal display device is connected to the portable computer. In addition, another object of the present invention is to provide a portable computer and a control method thereof, in which a user can selectively use automatic backlight adjustment.

도 1은 본 발명에 따른 휴대용 컴퓨터의 사시도,1 is a perspective view of a portable computer according to the present invention,

도 2는 도 1의 휴대용 컴퓨터의 제어블록도,2 is a control block diagram of the portable computer of FIG.

도 3은 본 발명에 따른 휴대용 컴퓨터의 제어순서도,3 is a control flowchart of a portable computer according to the present invention;

도 4는 종래의 휴대용 컴퓨터의 제어블록도이다.4 is a control block diagram of a conventional portable computer.

도면의 주요 부분에 대한 부호의 설명Explanation of symbols for the main parts of the drawings

1 : 휴대용 컴퓨터 2 : 어댑터1: portable computer 2: adapter

3 : 배터리 5 : DC/DC변환부3: battery 5: DC / DC converter

7 : 전원선택회로 9 : 시스템메인보드7: power selection circuit 9: system main board

10 : 컴퓨터본체 11 : 키입력부10: computer main body 11: key input unit

13 : 비디오카드 15 : 제어부13: video card 15: control unit

17 : 액정디스플레이장치 17a : 백라이트17: liquid crystal display device 17a: backlight

17b : 콘트라스트감지부 19 : 직류변환부17b: contrast detection unit 19: DC conversion unit

2１: 전압조정부 23 : DC/AC 인버터21: voltage regulator 23: DC / AC inverter

상기 목적은, 본 발명에 따라, 어댑터와 배터리중 적어도 어느 하나에 의한 전원을 공급하는 전원공급부가 마련된 컴퓨터본체와, 상기 전원공급부에 의해 구동되는 LCD패널과 상기 LCD패널을 조명하는 백라이트가 마련된 액정디스플레이장치를 갖는 휴대용 컴퓨터에 있어서, 상기 백라이트에 교류전원을 제공하는 인버터부와, 상기 LCD패널에 제공되는 영상신호의 콘트라스트를 감지하는 콘트라스트감지부와, 상기 콘트라스트감지부로부터의 PWM신호를 직류신호로 변환하는 직류변환부와, 상기 직류변환부와 상기 인버터부 사이에 마련되어 상기 직류변환부의 직류신호의 전압을 상기 인버터부의 구동전압과 일치시켜 상기 인버터부에 제공하는 전압조정부와, 상기 인버터부와 직렬로 연결되어 상기 인버터부의 구동전압을 감지하며 상기 구동전압에 기초하여 상기 전압조정부를 제어하는 제어부를 포함하는 것에 의해 달성된다.The object of the present invention is a liquid crystal provided with a computer main body provided with a power supply for supplying power by at least one of an adapter and a battery, an LCD panel driven by the power supply and a backlight for illuminating the LCD panel. A portable computer having a display device, comprising: an inverter unit for providing AC power to the backlight, a contrast detector for detecting contrast of an image signal provided to the LCD panel, and a PWM signal from the contrast detector; A DC converter configured to convert the voltage into a DC converter; and a voltage adjuster provided between the DC converter and the inverter, the voltage of the DC signal of the DC converter being equal to a driving voltage of the inverter, and provided to the inverter. Connected in series to sense the drive voltage of the inverter unit and the It is achieved by including a control section for controlling the voltage adjusting section.

여기서, 상기 제어부는 상기 인버터부에 직접 연결설치되고, 상기 콘트라스트감지부는 상기 직류변환부 및 상기 전압조정부를 거쳐 상기 인버터부에 연결설치되는 병렬구성으로 마련함으로써, 상기 제어부는 상기 인버터의 구동전압을 감지할 수 있고 상기 콘트라스트감지부가 설치되지 않은 일반 LCD장치를 연결설치할 때 사용자가 수동으로 백라이트를 조정할 수 있으며 별도의 보정회로가 필요하지 않게 된다.Herein, the control unit is directly connected to the inverter unit, and the contrast detection unit is provided in a parallel configuration connected to the inverter unit through the DC converter and the voltage adjusting unit, so that the controller controls the drive voltage of the inverter. When connecting and installing a general LCD device that can detect and not install the contrast detector, the user can manually adjust the backlight and does not require a separate correction circuit.

상기 콘트라스트감지부를 통한 백라이트자동조절을 차단하기 위한 백라이트수동선택부를 더 포함하며, 상기 백라이트수동선택부가 선택되었을 때 상기 제어부는 상기 전압조정부를 오프시킴으로써 백라이트자동조절을 사용자가 선택적으로 이용할 수 있다. 여기서, 상기 백라이트수동조정부는 상기 컴퓨터본체상에 마련된 키입력부로 마련하여 용이하게 콘트라스트감지부에 의한 백라이트자동조절을 차단할 수 있다.The apparatus may further include a backlight manual selection unit for blocking automatic backlight adjustment through the contrast detection unit. When the backlight manual selection unit is selected, the controller may selectively use backlight automatic adjustment by turning off the voltage adjustment unit. Here, the backlight manual adjustment unit may be provided as a key input unit provided on the computer body to easily block automatic adjustment of the backlight by the contrast detection unit.

한편, 본 발명의 다른 분야에 따르면, 상기 목적은, 어댑터와 배터리 중 적어도 어느 하나에 의한 전원을 공급하는 전원공급부가 마련된 컴퓨터본체와, 상기 전원공급부에 의해 구동되는 LCD패널과 상기 LCD패널을 조명하는 백라이트와 콘트라스트감지부가 마련된 액정디스플레이장치를 갖는 휴대용 컴퓨터의 제어방법에 있어서, 상기 백라이트에 교류전압을 공급하는 인버터의 구동전압을 감지하는 단계와, 상기 콘트라스트감지부에서 출력되는 백라이트조절신호를 직류신호로 변환한 후 상기 직류신호의 전압을 상기 인버터의 구동전압에 맞게 조정하여 상기 인버터에 제공하는 단계를 포함하는 것에 의해서도 달성된다.On the other hand, according to another field of the present invention, the object is a computer main body provided with a power supply for supplying power by at least one of the adapter and the battery, the LCD panel and the LCD panel driven by the power supply is illuminated A control method of a portable computer having a liquid crystal display device having a backlight and a contrast sensing unit, the method comprising: detecting a driving voltage of an inverter for supplying an AC voltage to the backlight; and converting a backlight control signal output from the contrast sensing unit into a direct current. And after converting the signal into a signal, adjusting the voltage of the DC signal according to the driving voltage of the inverter and providing the same to the inverter.

상기 백라이트수동조정여부를 선택하게 하는 단계와, 상기 백라이트수동조정이 선택되었을 때 상기 콘트라스트감지부에 의한 백라이트조정을 차단하고 사용자설정에 따라 백라이트를 조절하는 단계를 더 포함하여 사용자선택에 의해서 백라이트의 밝기가 조절되도록 구성할 수 있다.Selecting whether to manually adjust the backlight; and when the backlight manual adjustment is selected, blocking the backlight adjustment by the contrast sensing unit and adjusting the backlight according to a user setting. It can be configured to adjust the brightness.

이하에서는 첨부도면을 참조하여 본 발명에 대해 상세히 설명한다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

도 1은 본 발명에 따른 휴대용 컴퓨터의 사시도이다. 도면에 도시된 바와 같이, 휴대용 컴퓨터(1)는 중앙처리장치와 비디오카드를 비롯한 다수의 하드웨어가 내장되고 상판면에 사용자 조작에 따라 문자 및 제어신호를 입력하기 위한 키입력부(키보드)(5)가 마련된 컴퓨터본체(1)와, 컴퓨터본체(1)와 힌지결합되어 비디오카드로부터 인가되는 영상신호를 표시하는 액정디스플레이장치(17)로 구성된다.1 is a perspective view of a portable computer according to the present invention. As shown in the figure, the portable computer 1 has a plurality of hardware, including a central processing unit and a video card, and has a key input unit (keyboard) 5 for inputting characters and control signals according to a user's operation on the upper surface. And a liquid crystal display device 17 hinge-coupled with the computer body 1 to display an image signal applied from a video card.

액정디스플레이장치(17)내에는 LCD(Liquid Crystal Display)패널(16)과, LCD패널(15)의 상부 및 하부에 설치되어 LCD패널(15)을 조명하여 영상의 밝기를 조절하기 위한 백라이트(음극형광램프)(17a)와, 컴퓨터본체(10)의 비디오카드에서 인가된 영상신호를 처리하는 영상처리부와, LCD패널(16)에 표시되는 영상신호의 콘트라스트를 영상처리부로부터 감지하여 그 결과를 PWM신호로 출력하는 콘트라스트감지부(17b)가 마련된다.In the liquid crystal display device 17, a liquid crystal display (LCD) panel 16 and a backlight (cathode) for adjusting the brightness of an image by illuminating the LCD panel 15 are installed on the upper and lower portions of the LCD panel 15. Fluorescent lamp) 17a, an image processing unit for processing an image signal applied from a video card of the computer main body 10, and a contrast of the image signal displayed on the LCD panel 16 from the image processing unit, and the result is PWM. The contrast detecting unit 17b for outputting the signal is provided.

도시 않은 컴퓨터본체 내에는 콘트라스트감지부(17b)에서 출력되는 PWM펄스신호를 직류신호로 변환하는 직류변환부(19)와, 콘트라스트감지신호를 교류전원으로 변환하여 백라이트(17a)에 공급하는 DC/AC인버터부(23)와, 직류변환부(19)의 직류신호를 DC/AC인버터부(23)를 구동가능한 신호로 변경하는 전압조정부(21)와, DC/AC인버터부(23)와 직렬로 설치되는 제어부(15)가 설치된다. 여기서, DC/AC인버터부(23)는 0 볼트 ~ 수 볼트범위의 전압을 출력하며, DC/AC인버터부(23)의 출력전압의 크기에 따라 백라이트(17a)의 밝기가 자동으로 조절된다.The computer main body (not shown) includes a DC converter 19 for converting a PWM pulse signal output from the contrast detector 17b into a DC signal, and a DC / converter for converting the contrast detection signal into AC power and supplying it to the backlight 17a. In series with the DC / AC inverter unit 23, the voltage adjusting unit 21 for changing the DC signal from the AC inverter unit 23, the DC converter unit 19 into a signal capable of driving the DC / AC inverter unit 23, and the DC / AC inverter unit 23. The control unit 15 is installed. Here, the DC / AC inverter unit 23 outputs a voltage in the range of 0 volts to several volts, and the brightness of the backlight 17a is automatically adjusted according to the magnitude of the output voltage of the DC / AC inverter unit 23.

여기서, 제어부(15)는 DC/AC인버터부(23)의 구동전압을 감지하여 콘트라스트감지부(17b)의 감지신호의 전압크기가 DC/AC인버터부(23)를 구동시킬 만큼 크지 않을 때 전압조정부(21)에서 전압을 부스트업(Boost up)시키도록 제어한다.Here, the controller 15 senses the driving voltage of the DC / AC inverter unit 23 and the voltage when the voltage level of the detection signal of the contrast detecting unit 17b is not large enough to drive the DC / AC inverter unit 23. The control unit 21 controls to boost up the voltage.

그리고, 제어부(15)에는 키입력부(11)를 통해 백라이트의 밝기를 조절할 수 있는 제어프로그램이 마련되어 사용자가 선택한 백라이트밝기설정에 따라 백라이트(17a)의 밝기를 수동으로 조절한다. 본 발명에 따라 제어프로그램은 콘트라스트감지부(17b)에 의한 백라이트자동조절을 차단할 수 있도록 프로그램된다. 따라서, 키입력부(11)를 통해 백라이트수동조절이 선택되면 제어부(15)는 전압조정부(21)의 구동을 오프시켜 사용자가 수동으로만 백라이트를 설정하게 할 수 있다.In addition, the control unit 15 is provided with a control program for adjusting the brightness of the backlight through the key input unit 11 to manually adjust the brightness of the backlight 17a according to the backlight brightness setting selected by the user. According to the present invention, the control program is programmed to block automatic backlight adjustment by the contrast detection unit 17b. Therefore, when the backlight manual adjustment is selected through the key input unit 11, the controller 15 may turn off the driving of the voltage adjusting unit 21 so that the user manually sets the backlight.

한편, 키입력부(11)를 통한 백라이트(17a)의 수동조정은 휴대용 컴퓨터의 제품에 따라 키입력부(11)에 마련된 핫키(hot key) 또는 컴퓨터본체 일측에 마련된 별도의 밝기조절용 볼륨(volume)을 이용하여 조절한다.On the other hand, manual adjustment of the backlight 17a through the key input unit 11 may be performed by using a hot key provided on the key input unit 11 or a separate volume adjusting volume provided on one side of the computer main body according to a product of the portable computer. To adjust.

도 2는 도 1의 휴대용 컴퓨터의 제어블록도이다. 도면에 도시된 바와 같이, 휴대용 컴퓨터의 제어블록은 배터리(3)와 어댑터(2) 중 적어도 하나의 의해 전원을 공급하는 전원공급부와, 배터리(3) 또는 어댑터(2)를 선택하기 위한 전원선택회로(7)와, 전원공급부에 의해 공급된 전원을 시스템내의 각 장치의 구동전압으로 변경하는 DC/DC변환회로(5)와, 비디오카드가 마련되며 각 장치의 기본동작을 제어하는 시스템메인보드(9)와, 비디오카드로부터 제공된 영상신호를 표시하는 액정디스플레이장치(17)와, 액정디스플레이장치(17)내에 마련되어 영상신호의 콘트라스트를 감지하는 콘트라스트감지부(17b)와, 사용자 선택에 의해 수동으로 백라이트의 밝기를 설정하기 위한 키입력부(11)와, 시스템메인보드(9)를 통해 각 하드웨어장치에 제어신호를 인가하는 제어부(15)로 구성된다. 그리고, 휴대용 컴퓨터의 제어블록은 콘트라스트감지부(17b)에서 출력되는 PWM신호를 직류신호로 변경하는 직류변환부(19)와, 직류변환부에서 변경된 직류신호의 전압을 DC/AC인버터(23)의 구동전압에 맞게 조정하는 전압조정부(21)를 더 포함한다.FIG. 2 is a control block diagram of the portable computer of FIG. 1. As shown in the figure, a control block of a portable computer includes a power supply for supplying power by at least one of a battery 3 and an adapter 2, and a power selection for selecting a battery 3 or an adapter 2; A circuit 7, a DC / DC conversion circuit 5 for changing the power supplied by the power supply to the drive voltage of each device in the system, and a video card, and a system main board for controlling the basic operation of each device. (9), a liquid crystal display device 17 for displaying a video signal provided from a video card, a contrast detecting unit 17b provided in the liquid crystal display device 17, for detecting the contrast of a video signal, and manually selected by a user. The key input unit 11 for setting the brightness of the backlight and the control unit 15 for applying a control signal to each hardware device through the system main board (9). The control block of the portable computer includes a DC converter 19 for converting the PWM signal output from the contrast detector 17b into a DC signal, and a DC / AC inverter 23 for converting the voltage of the DC signal changed in the DC converter. It further includes a voltage adjusting unit 21 to adjust to the driving voltage of.

콘트라스트감지부(17b)는 액정디스플레이장치(17)의 영상처리부로부터 콘트라스트를 감지하여 밝기조절신호(콘트라스트감지값)를 PWM 신호로 출력한다. PWM형태의 백라이트(17a) 밝기조정신호는 직류변환부(19)로 입력되어 직류전압으로 변환되고, 직류전압으로 변환된 밝기조정신호는 전압조정부(21)에서 DC/AC인버터(23)를 구동가능한 직류전압으로 증폭하되나 감쇄된다.The contrast detecting unit 17b detects contrast from the image processing unit of the liquid crystal display device 17 and outputs a brightness control signal (contrast detection value) as a PWM signal. The backlight 17a of the PWM type brightness adjustment signal is input to the DC converter 19 to be converted into DC voltage, and the brightness adjustment signal converted to DC voltage drives the DC / AC inverter 23 in the voltage adjuster 21. Amplify to possible DC voltage but attenuate.

여기서, 사용자가 선택에 따른 제어부(15)의 백라이트조정신호와 콘트라스트감지부에서 출력되는 백라이트조정신호는 인버터(29)에 병렬로 인가된다. 따라서, 키입력부(11)를 통해 백라이트의 밝기가 MAX(최대)로 설정되어 있으면 콘트라스트감지부에 의해 최소 ~ MAX 범위내에서 백라이트의 밝기가 자동 조절되고, MIN(최소)으로 설정되어 있는 경우 최소 ~ MIN으로 조절된다.Here, the backlight adjustment signal of the controller 15 according to the user's selection and the backlight adjustment signal output from the contrast detection unit are applied in parallel to the inverter 29. Therefore, when the brightness of the backlight is set to MAX (maximum) through the key input unit 11, the brightness of the backlight is automatically adjusted within the minimum to MAX range by the contrast detector, and minimum when the brightness is set to MIN (minimum). Adjust to ~ MIN.

위의 제어블록의 구성으로 휴대용 컴퓨터의 제어순서를 서술하면 다음과 같다. 도 3은 본 발명에 따른 휴대용 컴퓨터의 제어순서도이다. 도면에 도시된 바와 같이, 제어부(15)는 액정디스플레이장치(17)에 콘트라스트감지부가 존재하는지 감지하고(S1), 콘트라스트감지부(17b)가 존재하면 제어부는 인버터부의 구동전압을 감지한다(S3). 콘트라스트감지부(17b)가 영상신호의 콘트라스트를 감지하여 콘트라스트감지값인 백라이트조정신호를 출력하면, 백라이트조정신호는 직류변환부에서 직류신호로 변환된다(S5). 직류신호로 변환된 백라이트조정신호는 전압조정부(21)에서 인버터부의 구동전압에 맞게 조정되고(S7) 조정된 직류신호는 인버터부(23)에 인가되며(S8), 인버터부(23)의 출력신호에 따라 백라이트 밝기가 자동조절된다(S11).Referring to the control procedure of the portable computer with the configuration of the above control block is as follows. 3 is a control flowchart of a portable computer according to the present invention. As shown in the figure, the controller 15 detects whether a contrast detection unit exists in the liquid crystal display device 17 (S1), and if the contrast detection unit 17b exists, the control unit detects a driving voltage of the inverter unit (S3). ). When the contrast detecting unit 17b detects the contrast of the video signal and outputs a backlight adjustment signal which is a contrast detection value, the backlight adjustment signal is converted into a DC signal by the DC converter (S5). The backlight adjustment signal converted into a DC signal is adjusted in accordance with the driving voltage of the inverter unit in the voltage adjusting unit 21 (S7), and the adjusted DC signal is applied to the inverter unit 23 (S8), and the output of the inverter unit 23 is output. The backlight brightness is automatically adjusted according to the signal (S11).

여기서, 사용자가 백라이트수동조절을 선택한 경우(S9) 제어부는 전압조정부의 동작을 오프(디스에이블)시켜 콘트라스트감지부에 의한 백라이트 자동조절신호를 차단하고(S10), 키입력부를 통한 사용자선택에 따라 백라이트를 수동조절한다(S12). 또한, 콘트라스트감지부가 존재하지 않은 경우에는 사용자 선택에 따른 제어부의 백라이트조절신호만이 인버터부로 인가되므로 수동으로만 백라이트의 밝기가 조절된다(S12).Here, when the user selects the backlight manual adjustment (S9), the control unit turns off (disables) the operation of the voltage adjusting unit to block the backlight automatic adjustment signal by the contrast detecting unit (S10) and according to the user selection through the key input unit. Manually adjust the backlight (S12). In addition, when the contrast detection unit does not exist, only the backlight control signal of the controller according to the user's selection is applied to the inverter unit, so that the brightness of the backlight is manually adjusted (S12).

여기서, 콘트라스트부의 동작을 차단하는 백라이트수동선택부를 버튼으로 마련하여 백라이트감지부를 이용한 백라이트의 자동조절을 사용자가 취향에 따라 온오프시키도록 구성할 수도 있다.Here, the backlight manual selection unit for blocking the operation of the contrast unit may be provided as a button so that the automatic adjustment of the backlight using the backlight detection unit may be turned on or off according to the user's preference.

이러한 구성에 의하여, 사용자가 선택한 백라이트 밝기의 설정범위 내에서 콘트라스트감지부를 통해 콘트라스트의 크기에 따라 자동으로 백라이트의 밝기를 조절할 수 있다. 그리고, 콘트라스트감지부를 장착한 LCD디스플레이부를 갖는 휴대용 컴퓨터에서 제어부와 인버터부를 직접 연결하고 콘트라스트감지부는 백라이트제어신호를 직류로 변환하는 직류변환부와 전압조정부를 거쳐 DC/AC인버터부에 연결하여 제어부와 DC/AC인버터부의 임피던스를 매치시킴으로써 일반 액정디스플레이장치를 휴대용 컴퓨터에 장착시에 별도의 전압보정회로가 필요하지 않게 된다. 또한, 전원공급부가 배터리가 아닌 어댑터인 경우 콘트라스트감지부에 의한 백라이트조정을 차단함으로써 사용자가 수동으로 백라이트를 조정하게 할 수 있다.By such a configuration, the brightness of the backlight may be automatically adjusted according to the size of the contrast through the contrast detecting unit within the setting range of the backlight brightness selected by the user. In a portable computer having an LCD display unit equipped with a contrast detection unit, the control unit and the inverter unit may be directly connected, and the contrast detection unit may be connected to a DC / AC inverter unit through a DC converter and a voltage adjusting unit for converting a backlight control signal into DC. By matching the impedance of the DC / AC inverter part, a separate voltage correction circuit is not required when a general liquid crystal display device is mounted in a portable computer. In addition, when the power supply unit is an adapter instead of a battery, the user may manually adjust the backlight by blocking the backlight adjustment by the contrast detection unit.

이상 설명한 바와 같이, 본 발명에 따르면, 콘트라스트감지부의 감지신호에 따른 백라이트조정전압을 인버터의 구동전압에 맞추어 정상적으로 백라이트의 밝기를 조절할 수 있으며, 인버터의 입력임피던스에 관계없이 최적의 상태로 동작할 수 있다. 그리고, 일반 액정디스플레이장치를 휴대용 컴퓨터에 연결시에 별도의 전압보정회로가 필요하지 않게 된다. 또한, 본 발명에 따르면, 사용자가 백라이트자동조절을 선택적으로 이용할 수 있다.As described above, according to the present invention, the brightness of the backlight can be adjusted normally according to the backlight control voltage according to the detection signal of the contrast detection unit according to the drive voltage of the inverter, and can be operated in an optimal state regardless of the input impedance of the inverter. have. In addition, when the general liquid crystal display device is connected to the portable computer, a separate voltage correction circuit is not required. In addition, according to the present invention, the user can selectively use the automatic backlight adjustment.

Claims (6)

어댑터와 배터리중 적어도 어느 하나에 의한 전원을 공급하는 전원공급부가 마련된 컴퓨터본체와, 상기 전원공급부에 의해 구동되는 LCD패널과 상기 LCD패널을 조명하는 백라이트가 마련된 액정디스플레이장치를 갖는 휴대용 컴퓨터에 있어서,A portable computer having a computer main body provided with a power supply unit for supplying power by at least one of an adapter and a battery, an LCD panel driven by the power supply unit, and a liquid crystal display device having a backlight for illuminating the LCD panel. 상기 백라이트에 교류전원을 제공하는 인버터부와,An inverter unit for providing AC power to the backlight; 상기 LCD패널에 제공되는 영상신호의 콘트라스트를 감지하는 콘트라스트감지부와,A contrast detecting unit detecting a contrast of an image signal provided to the LCD panel; 상기 콘트라스트감지부로부터의 PWM신호를 직류신호로 변환하는 직류변환부와,A DC converter converting the PWM signal from the contrast detector into a DC signal; 상기 직류변환부와 상기 인버터부 사이에 마련되어 상기 직류변환부의 직류신호의 전압을 상기 인버터부의 구동전압과 일치시켜 상기 인버터부에 제공하는 전압조정부와,A voltage adjusting unit provided between the DC converting unit and the inverter unit to provide the inverter unit with the voltage of the DC signal of the DC converting unit equal to the driving voltage of the inverter unit; 상기 인버터부와 직렬로 연결되어 상기 인버터부의 구동전압을 감지하며 상기 구동전압에 기초하여 상기 전압조정부를 제어하는 제어부를 포함하는 것을 특징으로 하는 휴대용 컴퓨터.And a controller connected in series with the inverter unit to sense a driving voltage of the inverter unit and to control the voltage adjusting unit based on the driving voltage. 제1항에 있어서,The method of claim 1, 상기 제어부는 상기 인버터부와 직접 연결설치되고, 상기 콘트라스트감지부는 상기 직류변환부 및 상기 전압조정부를 거쳐 상기 인버터부에 연결설치되는 병렬구성인 것을 특징으로 하는 휴대용 컴퓨터.And the control unit is directly connected to the inverter unit, and the contrast detection unit is connected in parallel to the inverter unit via the DC converter and the voltage adjusting unit. 제1항에 있어서,The method of claim 1, 상기 콘트라스트감지부를 통한 백라이트자동조절을 차단하기 위한 백라이트수동선택부를 더 포함하며, 상기 백라이트수동선택부가 선택되었을 때 상기 제어부는 상기 전압조정부를 오프시키는 것을 특징으로 하는 휴대용 컴퓨터.And a backlight manual selection unit for blocking automatic backlight adjustment through the contrast detection unit, wherein the controller turns off the voltage adjustment unit when the backlight manual selection unit is selected. 제3항에 있어서,The method of claim 3, 상기 백라이트수동선택부는 상기 컴퓨터본체상에 마련된 키입력부를 통해 선택되는 것을 특징으로 하는 휴대용 컴퓨터.And the backlight manual selection unit is selected through a key input unit provided on the computer body. 어댑터와 배터리 중 적어도 어느 하나에 의한 전원을 공급하는 전원공급부가 마련된 컴퓨터본체와, 상기 전원공급부에 의해 구동되는 LCD패널과 상기 LCD패널을 조명하는 백라이트와 콘트라스트감지부가 마련된 액정디스플레이장치를 갖는 휴대용 컴퓨터의 제어방법에 있어서,A portable computer having a computer main body provided with a power supply unit for supplying power by at least one of an adapter and a battery, an LCD panel driven by the power supply unit, and a liquid crystal display device having a backlight and a contrast sensing unit for illuminating the LCD panel. In the control method of, 상기 백라이트에 교류전압을 공급하는 인버터의 구동전압을 감지하는 단계와,Detecting a driving voltage of an inverter supplying an AC voltage to the backlight; 상기 콘트라스트감지부에서 출력되는 백라이트조절신호를 직류신호로 변환한 후 상기 직류신호의 전압을 상기 인버터의 구동전압에 맞게 조정하여 상기 인버터에 제공하는 단계를 포함하는 것을 특징으로 하는 휴대용 컴퓨터의 제어방법.And converting the backlight control signal output from the contrast detector into a direct current signal and adjusting the voltage of the direct current signal according to the drive voltage of the inverter to provide the inverter to the inverter. . 제5항에 있어서,The method of claim 5, 상기 백라이트수동조정할 것인지 여부를 선택하게 하는 단계와,Selecting whether to manually adjust the backlight; 상기 백라이트수동조정이 선택되었을 때 상기 콘트라스트감지부에 의한 백라이트조정을 차단하고 사용자설정에 따라 백라이트를 조절하는 단계를 더 포함하는 것을 특징으로 하는 휴대용 컴퓨터의 제어방법.When the backlight manual adjustment is selected, controlling the backlight according to the contrast detection unit and adjusting the backlight according to a user setting.
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KR100381423B1 (en) 2003-04-26
CN1264086C (en) 2006-07-12
US6963329B2 (en) 2005-11-08
JP2003058131A (en) 2003-02-28
US20030016204A1 (en) 2003-01-23
JP3697201B2 (en) 2005-09-21

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